Reciprocating gear mechanism.



W. L. HAMILTON.

RECIPBOCATIBG GEAR MEGHANISM.

APPLICATIOH FILED DEC. 24, 1909.

Patented Apr. 19,1910.A

2 SHEETS-SHEET 2.

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WILLIAM L. HAINIILTON, OF CHICAGO, ILLINOIS.

Specification of Letters Patent.

RECIPROCATING GEAR MECHANISM..

PatentedApr. 19, 1910.

Application tiled December 24, 1909. Serial No. 534,874.

To all whom it may concern:

Be it known that I, WILLIAM L. HAMIL- TON, a citizen of the UnitedStates, and resident of Chicago, county of Cook, and State of Illinois,have invented certain new and useful Improvements in Reciprocating GearMechanism, of which the following is a specification and which areillustrated in the accompanying drawings, forming a partthereof.

The invention relates to gear mechanism for converting'rotary movementinto reciprocating movement, and has for its object to provide areciprocating gear mechanism of improved form, wherein the reciprocatingpart is driven at the same speed in both directions.

The invention is exemplified in the structure to be hereinafterdescribed and illustrated in the accompanying drawings, wherein- Figure1 is a detail side elevation of a cylinder printing press having theinvention applied thereto; F ig. 9. is an inside face view of certain ofthe gears illustrated in Fig. l taken on the line 2 2 of Fig. 3; and Fig. 3 is a plan sectional view taken on the line 3 3 of F ig. 1.

The frame of a cylinder printing press is generally designated by thenumeral 10 in the drawings. The bed of the press is represented at 11.As is usual in devices of this kind, the bed 11 has a longitudinalreciproeating movement in the frame 10, and is driven by an intermeshinggear rack 19., and pinion 13, mounted respectively upon the underside ofthe bed 11 and on a shaft 14, which extends transversely through theframe 10, below the bed. Power is applied to a belt pulley 15 whichrotates upon a short shaft 1G mounted in the frame 10 adjacent one ofits sides. For transmitting power to the other parts of the machine, thebelt pulley 15, as shown, has a pinion 17 formed on its hub.

The invention as applied to the printing press illustrated, is employedfor converting the continuous rotary movement of the belt pulley 15 andpinion 17 into reciprocating movement in the shaft 1+i, and bed 1l. Agear plate 18 having a iange 19 provided with outwardly facing gearteeth 20, meshes with and is driven by the pinion 17. As shown, the gearplate 18 is mounted upon the end of a shaft 21, which extends throughthe frame 10 of the machine parallel with the shaft 14. Preferably thegear plate 1S covers the end of the shaft 11 and a pinion 2'2 mountedthereon. A gear ring )Il also covered by the gear plate 1S, encirclesthe shaft 21 and meshes with the pinion QQ. As showma bearing '24 forthe gear ring 23 is formed upon the side of the frame 10, and the gearring is held to its seat thereon hy the hub of the gear plate 1S.

.1n inwardly facing gear segment 25 is formed upon the flange 1%) of thegear plate 1S and meshes alternately with the pinion 212 and with thegear ring Q3. When the gear segment 25 is engaged with the gear ring Q,thc pinion 22 and the shaft 14 are driven in the opposite direction tothat in which the)Y are turned by direct engagement of the gear segmentQ5 with the pinion Q2, but atthe same speed. .lreferably, the gearsegment Q5 is of such length that it becomes disengaged from one of thegear members 2'2, Q3, before it engages the other, and cams are providedfor reversing the direction of movement of the pinion when this 1r berand the gear ring are free to turn 1ndependentl \v of the gear plate 18.

As shown, reversing cams 2S, Q9, are mounted on the inner face of theplate 1S, and cam .shoes which conveniently take the form of pins Q6.QT, project from the face of the pinion "22 to cooperate with thereversing cams QS, 9.9. In the operation of the parts: if the gear plate1S be turned by the pinion 1i' in the direction indicated by the arrowin Fig. 1, the cam 9S will engage the cam shoe 2T to reverse thedirection of rotation of the pinion Q2 and ring 23 as the gear segment25 passes ont of engagement with the pinion 22, and the cani 29 willengage the cam shoe 26 to reverse the direction of rotation of thepinion Q2 and ring 23 as the gear segmentrl passes out of engagementwith the gear ring 23.

As the gear ring meshes continuously with the pinion 22, other parts ofthe machine, which are to be moved in unison with the bed 11, may beconvenientlv driven from it. In the drawings, a shaft 30 which mayextend over the bed for the purpose of dri ving the inking rollers (notshown), is provided with a pinion 31, which meshes with the gear ringE23. The usual gear 3Q, half the size of the gear 13 employed fordriving the bed 11, is shown mounted on the shaft 14 adjacent the gear13 for driving the antifriction rollers which support the bed.

gears, a plate having an inwardly facing gear segment movable about theirstaiamed gearsl and engageable with them in alternation, and arevereing cam carried by the plate.

In combination a pair of intermeshmg gears, an inwardly facing circulargear segment movable about the first named` gearsand engageable withthem in alternation, the arrangement being such `that the gear segmentis not engaged with either of the said gear:` during a part of therevolution of the segment, and means for rever ing the direction ofrotation of the tiret namedgears when neither of them is enraged withthe (fear seffment.

D D C In combination, a pair of intermeahing gears, a cam shoe mountedon one of the gear, an inwardly facing circular gear segment movableabout the tiret-named gears and engageable with them in alternation, thearrangement being Such that. the gear aegmentv is not engaged witheither oi the a said gears during a part of the revolution of thesegmentand a reversing cam engageable with the said cam shoe when thegear segment is out of engagement with the gears.

4. In combination, a pair of intermeshing gears, a continuously rotatingplate having an inwardly facing gear Segmentmovable aboutJ thefirst-named gears and engageable with them in alternation, thearrangement being auch that the gear segment becomes disengaged fromeach of said gears before it engages the other, and a pair of reversingcams mounted on the plate and operable in f alternation, one of saidcams being engaged with one of the tiret-named geara between eachengagement ol' the gear aegment with the said gears.

In a printing presa. in combination, a power shaft, a bed driving shaftparallel with the power A hai't. a pinion on the bed driving shaft, agear ring encircling the power .shaft and meshing with the pinion, apair ot' cam Shoes on the pinion, a plate tixed to the power shaft aridhaving an inwardly facing gear Segment movable about the pinion and thegear ring. and engageable with them in altermition, the arrange- I mentbeingv such that the gear segment becomes disengaged from earhoi' saidmembers before it engages the other, and a pair of reversing camsmounted on the plate and operable upon the eam shoe-.s on the pinion inalternation, one ot' said trams being engaged with the cor1'e-'pomlingcam ihoe between each engagement of the gear segment with thetiret-named gear members.

(i. ln combination a pair ot' intermeshing gears, an inwardly` lacingcircular gear Segment movable about. the tiret named gears 'andengageable with' them in alternation, the arrangtanent being auch thatthe gear segment becomes disengaged from each oi said geara before itengagea` the other, and means for reversing the direction of rotation ofthe lirst named gears between each engagement of the gear Segment withthe Said gears. i

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vitnesses tnannea B. Gnmsox, .l) \isv F. HUGHES.

